Contents  on 1 June '11

Resources:

The latest A/CC news is available via framed access, RSS news feed RSS news feed, or redirection. - Note: A/CC has a main Web site and also a backup site with its own duplicate RSS news feed.

Navigation tips: Use the << and >> arrows on the menus for each regular section (Observers, Risks, etc.) to move to the previous and next day's news for that section. Use the Index menu item to access specific days through a calendar interface. And use the all-up news archive to access news from any time since A/CC began in early 2002. To keep track of what's new each day, watch the Chronology section.

NEOCP Activity  on 1 June '11

The MPC's NEO Confirmation Page has 53 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 53 objects listed. Of these, 30 were "one nighters." So far The Tracking News has counted a total of 77 listings on the NEOCP today.

To learn how observers use the NEOCP, see the Practical guide on how to observe NEOCP object at Suno Observatory by Birtwhistle et al.

New MPECs  on 1 June '11

Minor Planet Electronic Circulars

As of last check at 2359 UTC, there have been six MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2011-L06 - "15:42 UT" - S/2010 J 1 and S/2010 J 2


<< DOU on 1 June '11 >>  MPEC 2011-L05 - "07:08 UT" - Daily Orbit Update


MPEC 2011-L04 - "01:17 UT" - Comet C/2011 K1 (Schwartz-Holvorcem)


MPEC 2011-L03 - "00:36 UT" - 2011 KP17


MPEC 2011-L02 - "00:34 UT" - 2011 KO17


MPEC 2011-L01 - "00:33 UT" - 2011 KN17

Observers  on 1 June '11

A total of 23 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 11 in MPECs 2011-L01, 2011-L04 & 2011-L05 -- 2011 KN9, 2011 KN17, 2011 KH4, 2011 KG4, 2011 KF9, C/2011 K1, 2011 HT, 2011 HP24, 2011 HP, 2011 HL7, 2011 GQ65
703Catalina Sky Survey in Arizona, 1 in MPEC 2011-L04 -- C/2011 K1
807|Robert Holmes via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 9 in MPECs 2011-L02, 2011-L04 & 2011-L05 -- 2011 KW15, 2011 KV15, 2011 KR12, 2011 KO17, 2011 KF4, 2011 KE3, 2011 KD11, 2011 KC15, C/2011 K1
106Crni Vrh Obs. in Slovenia, 2 in MPECs 2011-L03 & 2011-L05 -- 2011 KP17, 2008 GV20
J04ESA Optical Ground Station in the Canary Islands, 1 in MPEC 2011-L04 -- C/2011 K1
J95Great Shefford Obs. in England, 3 in MPECs 2011-L01, 2011-L02 & 2011-L05 -- 2011 KO17, 2011 KN17, 2011 KE15
H15ISON-NM Obs. in New Mexico, 2 in MPECs 2011-L04 & 2011-L05 -- C/2011 K1, 275714
704LINEAR in New Mexico, 3 in MPECs 2011-L01, 2011-L02 & 2011-L04 -- 2011 KO17, 2011 KN17, C/2011 K1
H01Magdalena Ridge Obs. (MRO) in New Mexico, 5 in MPECs 2011-L01, 2011-L02, 2011-L03, 2011-L04 & 2011-L05 -- 2011 KP17, 2011 KO17, 2011 KN17, C/2011 K1, 2011 AG5
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2011-L05 -- 2009 DR36
G96Mt. Lemmon Survey (MLS) in Arizona, 2 in MPEC 2011-L05 -- 2008 JV19, 153002
A24New Millennium Obs. in Italy, 12 in MPEC 2011-L05 -- 2011 HQ, 2011 GQ65, 2011 AO52, 2010 TU5, 2008 AS28, 2004 JO2, 37336, 275714, 263976, 163250, 162463, 1866
F51Pan-STARRS 1 (PS1) in Hawaii, 4 in MPEC 2011-L05 -- 2011 HL7, 2010 FF7, 2009 WW104, 2008 GV20
H06%Ernesto Guido in Italy via RAS Obs. Mayhill in New Mexico, 1 in MPEC 2011-L02 -- 2011 KO17
H06|Hidetaka Sato in Japan via RAS Obs. Mayhill in New Mexico, 2 in MPECs 2011-L01 & 2011-L04 -- 2011 KN17, C/2011 K1
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 2 in MPECs 2011-L01 & 2011-L02 -- 2011 KO17, 2011 KN17
854Sabino Canyon Obs. in Arizona, 2 in MPECs 2011-L01 & 2011-L02 -- 2011 KO17, 2011 KN17
104San Marcello Pistoiese Obs. in Italy, 1 in MPEC 2011-L04 -- C/2011 K1
204Schiaparelli Obs. in Italy, 1 in MPEC 2011-L04 -- C/2011 K1
I93St. Pardon de Conques Obs. in France, 3 in MPECs 2011-L01, 2011-L04 & 2011-L05 -- 2011 KP17, 2011 KN17, C/2011 K1
926Tenagra II Obs. in Arizona, 2 in MPECs 2011-L03 & 2011-L04 -- 2011 KP17, C/2011 K1
B18Terskol Obs. in Russia, 3 in MPECs 2011-L01, 2011-L03 & 2011-L04 -- 2011 KP17, 2011 KN17, C/2011 K1
H10Tzec Maun Obs. Mayhill in New Mexico, 1 in MPEC 2011-L04 -- C/2011 K1
D96Tzec Maun Obs. Moorook in South Australia, 1 in MPEC 2011-L02 -- 2011 KO17
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 1 June '11

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2359 UTC)
See the CRT page for a list of all objects rated recently as risks and our ephemerides page for a list of risk-listed objects under current observation.
The time horizon for JPL is 100 years from today and for NEODyS is usually the year 2090. Both also post impact solutions beyond 100 years for a few special objects.
For the latest official risk assessments, and for explanations of the terminology, see the JPL NEO Program Sentry and NEODyS CLOMON (backup) risk pages.
0000NNN000

Object

Risk
Monitor
When
Noted
UTC
0000T0000
Year
Range

VI
#
000NN00
Prob
Cum
T0000
PS
Cum
T0000
PS
Max

T
S


Notes for Today's Latest Risk Assessments
2011 KN17NEODyS15232071-207827.45e-07-4.80-4.80NEODyS: "Based on 35 optical observations (of which 0 are rejected as outliers) from 2011-05-30.279 to 2011-06-01.002."
JPL Sentry0201207117.2e-07-4.82-4.820JPL: "Analysis based on 35 observations spanning 1.7228 days (2011-May-30.27802 to 2011-Jun-01.0008)." Diameter approximately 0.110 km. from mean, weighted H=22.4.
2011 KE15JPL Sentry15232020-204956.8e-05-4.48-4.490JPL: "Analysis based on 17 observations spanning 5.7193 days (2011-May-26.26154 to 2011-May-31.980825)." Diameter approximately 0.014 km. from mean, weighted H=26.9.
NEODyS15232020-206997.32e-05-4.44-4.450NEODyS: "Based on 17 optical observations (of which 0 are rejected as outliers) from 2011-05-26.262 to 2011-05-31.982."
2011 AG5JPL Sentry17352040-204734.6e-04-1.66-1.661JPL: "Analysis based on 131 observations spanning 143.19 days (2011-Jan-08.2673 to 2011-May-31.45444)." Diameter approximately 0.140 km. from mean, weighted H=21.9.
NEODyS15232040-205864.54e-04-1.67-1.671NEODyS: "Based on 131 optical observations (of which 0 are rejected as outliers) from 2011-01-08.268 to 2011-05-31.455."

Legend: VI# = VI count, Prob Cum = cumulative probability, PS Cum/Max = cumulative/maximum Palermo Scale, TS = Torino Scale

An impact solution, also known as a "virtual impactor" (VI), is not a prediction but rather a possibility derived from a variant orbit calculation that cannot be eliminated yet based on the existing data. Elimination can come quickly with just a little further observation or may take weeks or months, sometimes years. Once superceded or eliminated, a former impact solution has zero relevance to an object's risk. See Jon Giorgini's "Understanding Risk Pages" to learn more.

Chronology  on 1 June '11

Times are UTC for when items were noted or added by The Tracking News.

1735Noted that JPL Sentry has updated its 2011 AG5 risk assessment - see above
1619Grabbed MPEC 2011-L06 - S/2010 J 1 and S/2010 J 2 - see above
1523Noted that NEODyS has updated its 2011 AG5 risk assessment - see above
Noted that JPL Sentry has updated its 2011 KE15 risk assessment - see above
Noted that NEODyS has updated its 2011 KE15 risk assessment - see above
Noted that NEODyS has posted 2011 KN17 as an impact risk - see above
Grabbed MPEC 2011-L05 - Daily Orbit Update - see above
0201Noted that JPL Sentry has posted 2011 KN17 as an impact risk - see above
Grabbed MPEC 2011-L01 - 2011 KN17 - see above
Grabbed MPEC 2011-L02 - 2011 KO17 - see above
Grabbed MPEC 2011-L03 - 2011 KP17 - see above
Grabbed MPEC 2011-L04 - Comet C/2011 K1 (Schwartz-Holvorcem) - see above